Trace conditioning as an inhibitory procedure

Virtually no evidence of excitatory CR acquisition is observed in rabbit eyelid conditioning with a trace-conditioning procedure if the CS-UCS trace interval is greater than a few seconds. The lack of overt CRs following training with a trace-conditioning procedure has traditionally been interpreted as due to the passive decay of the CS stimulus trace over time. However, it is conceivable that a trace interval sufficiently long to preclude CR …